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You might still have another desktop manager in your .xsession config.

cd /home/youruser

echo "gnome-session --session=ubuntu-2d" > .xsession

sudo /etc/init.d/xrdp restart

I've had a similar issue and this solved it.

For future readers of this post (I found this post top of my Google search when I had the same problem), xrdp no longer seems to work with Ubuntu-2d in Ubuntu 14.04. Instead you must install xfce

sudo apt-get install xfce4

Then add the line

xfce4-session

to your ~/.xsession file instead of the gnome-session --session=ubuntu-2d line

Try this. Just press Ctrl+Alt+T on your keyboard to open Terminal. When it opens, run the command(s) below:

sudo apt-get install gnome-session-fallback

echo “gnome-session -–session=gnome-fallback” > ~/.xsession

sudo /etc/init.d/xrdp restart

If I understood you correctly, you have Win 7 machine (rdp client) and ubuntu 11.10 (rdp server).

If you have unity 3d enabled in ubuntu, that will cause problems. Use gnome session fallback:

sudo apt-get install gnome-session-fallback

(you have to log out and select "gnome classic no effects")

..or xubuntu (xfce) :

sudo apt-get install xubuntu-desktop

..or lubuntu (lxde):

sudo apt-get install lubuntu-desktop

Also, try using rdesktop from command line. Looks like xrdp and other rdp gui programs don't support rdesktop's full capabilities, so it's best to use the command line directly.

rdesktop -h

if you still have the problem,

you can have a look at this post,
for me, it's seems well explained

http://c-nergy.be/blog/?p=2879

Hope this will be helpfull for other as well

Add a backslash in front of your login, like: yourlogin

This made it work for me. It removes the domain from your credential.

I have tried it with the 2D version also and same issue. How do you use the command line from Win7 into Ubuntu?

          – nitefrog Dec 31 '11 at 1:05

Try Bitvise Tunnelier. It runs like a champ for terminal, FTP and RDP from Windows.

I would try using the vnc sharing built into Ubuntu. I think you will find this more reliable and less buggy. This guide will show you how to setup VNC sharing on Ubuntu and explain some port forwarding techinques.

This is more of a workaround, but if you get a blank desktop, then there might be a question on the remote Ubuntu computer asking whether to refuse or allow. Just click the allow button from the alert.

Try a different desktop manager. While using lightdm I was getting a blank/black screen via XRDP. Once I switched to lxdm everything worked as expected.

A limitation of the xrdp is that you can only login to desktop:0

I was logged in on the target machine as well as trying to connect. Once I logged out of the server I was able to login.

See here, it's the best solution until now for Ubuntu 13.10. Scroll down see brian mullan's coments.
I installed x2go and works like a charm on KDE Ubuntu 13.10
No more xrdp.

http://c-nergy.be/blog/?p=4448&cpage=1#comment-1013

Have a nice day all ...